In terms of perspective projection transformation this paper study the technology of spatial 3-d coordinate. New camera calibration technique is proposed.

以透视投影变换为依据，研究了空间三维测量技术，提出了一种新的标定方法。

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This Paper study the intersection and union operations, with it establishes the algebraic structure of equivalence relations.

本文主要研究了等价关系的交并运算，建立了等价关系对于交并运算的代数结构。

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This paper study the method of preparation of dry water by hydrophobic fumed SiO2 HB-630, and observe the appearance of water by micro-optical microscope.

本文系统研究了以疏水性气相二氧化硅HB-630制备干水的方法，采用微观光学显微镜对干水的形貌结果进行观察。

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Susan Brink is a health reporter for The Los Angeles Times and she wrote about this new study for the paper, and welcome to the show.

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This study echoes a paper released in November by the U.S. Government Accountability Office, which found that customers end up paying higher prices for goods and services because the fees that a seller pays to Visa and MasterCard are built into the retail price.

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Leszczynski argued that the limitations of this study amounted to failure of the peer review system and called for the retraction of the paper and an investigation into why it was published in the first place.

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